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Michael P. D'Alessandro, M.D.
Peer Review Status: Internally Peer Reviewed
Etiology/Pathophysiology:
The ratio of duodenal atresia to duodenal stenosis is 4:1. The point
of atresia is distal to the ampulla of Vater in 75-80% of patients.
Related anomalies include: Downs Syndrome in 30%, esophageal atreasia
and tracheoesophageal fistula in 13%, multiple intestinal atresias in
15%, and annular pancreas in 21%.
Pathology:
Not applicable
Imaging Findings:
On an abdominal film, a gas distended stomach and duodenum gives the
"double bubble" sign with no gas distal to the duodenum in duodenal
atresia. Once duodenal obstruction is recognized further imaging is
usually unnecessary as surgery is indicated emergently. If further
imaging is required, air, non-ionic contrast or barium can be
injected though a nasogastric tube to better outline the level of
obstruction.
DDX:
High bowel obstruction
References:
See References Chapter.
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